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Journal of Healthcare Engineering
Volume 2017, Article ID 8264071, 11 pages
Research Article

Fall Prevention Shoes Using Camera-Based Line-Laser Obstacle Detection System

1Graduate Institute of Color and Illumination Technology, National Taiwan University of Science and Technology, No. 43, Sec. 4, Keelung Rd., Taipei 10607, Taiwan
2National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan

Correspondence should be addressed to Tzung-Han Lin; wt.ude.tsutn.liam@lht

Received 9 February 2017; Accepted 20 April 2017; Published 17 May 2017

Academic Editor: Junfeng Gao

Copyright © 2017 Tzung-Han Lin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Fall prevention is an important issue particularly for the elderly. This paper proposes a camera-based line-laser obstacle detection system to prevent falls in the indoor environment. When obstacles are detected, the system will emit alarm messages to catch the attention of the user. Because the elderly spend a lot of their time at home, the proposed line-laser obstacle detection system is designed mainly for indoor applications. Our obstacle detection system casts a laser line, which passes through a horizontal plane and has a specific height to the ground. A camera, whose optical axis has a specific inclined angle to the plane, will observe the laser pattern to obtain the potential obstacles. Based on this configuration, the distance between the obstacles and the system can be further determined by a perspective transformation called homography. After conducting the experiments, critical parameters of the algorithms can be determined, and the detected obstacles can be classified into different levels of danger, causing the system to send different alarm messages.